just wondering what the stock engine can handle in terms of power.

Just how much hp can the stock internals take ? I know the srt-4's have awesome holding power, something like 400-450 hp i think. And from what i have been hearing on here a mere 300 is pushing it on ours. Everyone seems to be talking about being a "piston #4 victim". Are our engines pretty weak ?

 

Our Fuel systems are weak


Returnless FTMFL

 

They say 350 is about the limit if your running your car perfect. But one bad mess up on the afr and the motor will get messed up haha. SO I would stay in the 300 range.

 

350 whp or motor ? cause 350 motor is like what ? 290ish wheel ? Thats not alot !

 

The engines are stronger than most people think BUT the people who are attempting to push it are doing it with a inefficient stock supercharger that's building more heat than a 500 lb fat man sitting on a metal chair on a hot summer day in Arizona.

 

You live in Arizona now??


hahaha j/k, Adam, I love ya

 

I love you too

 

I thought our blocks were good for well beyond 300. I thought it was just the pistons that were weak...

 

It's just the AFR in our engines, it needs to be more closely adjusted / monitored

 

Not the a/f (well some of the time they do) but it's more so the combustion chamber temperatures that are being created.

 

Well I think its contributed in a large part due to AFRs

 

But not in every case...

 

 

According to GM if the pistons are swapped out you can make a little over 300WHP with the stock supercharger and higher compression. If that is the case, if one were to swap in stronger pistons and swap to a turbo then the rest of the components in the block could take WELL over 300WHP.

Just judging by the materials used my rough estimate would be that the crank itself would be able to handle around 400WHP or a little more (This is just IMO, not a fact). That's not a hard number but since the crank is forged and you would be able to make the adjustment to a LOWER compression to go with a high boost turbo, this power would be made using high boost high rpm, and less heat than the M62. If your goal was to build high HP and you weren't going for the big torque so much, you may even be able to get even more but many changes would have to be made to the efficiency of the head etc. But, as far as purely the materials used, the LSJ is a STRONG motor besides the pistons.

 

Hack, that's true on any forced induction car, once you crank up the boost.

in truth, the block can take a LOT, as can the crank...

in the 2.2 the rods are good till the mid 200s, and in the 2.4 and 2.0 the mid 300s...

if you're going to want lots of power, in any of them, forged pistons is a must.

 

Well here you go like i posted in the other thread: "GM Racing dynamometer tests confirm that major HP gains are possible w/ minimal mods. For instance, when building an ECOTEC engine up to 400HP level, no mods. to the cylinder head, block, main girdle or crankshaft are required." but if u go over that you will need to replace the block and install all those other parts. And really its easy to get 400HP out of these engines w/o the help of a NOS. These engines are also proven reliable and effective up to 11,000rpm. Hopes that helps out.

Ha sry i was jus reading over the thread and saw this. There is no way u use 60HP from the engine when the axle comes rite out the side of the engine. lol This isnt a RWD car now.

 

ok great, whatis the power loss then ?

 

for how much power it can handle it all depend what is used for force induction used

supercharger creates lots of heat at high boost but a turbo at same boost will make way more power and creates way less heat

i didnt doo to many cobalts but i know it may start a war here

i did a few stock h22 honda motors, rod and piston are stock in every one ,just install a ticker head gasket on them

i have 3 0f them running turbo making over 350 whp at 15psi and one 400 whp at 18psi and all of them still running over 2 years

and i did one jacktion racing superchager one the motor is the same as the other motor at 12 psi making 210 whp timing set 4 degree lower than the turbo motor to stop the knock and it blew up twice

supercharger is a great system but only made to run a certain boost level
trying to make more power than it made for your only looking for problem

my estimate is a supercharge colbalt 250 whp it going to last
350 whp whit a turbo one whit the proper air/fuel and timing

 

the engine can handle roughly 8 to 10 lbs of boost if you can ever figure out how to tune the computer. With forged pistons and rods the engine will be able to handle 500hp. but again you have to figure out how to tune the computer or use stand alone fuel managment to get the power you want from a turbo

 

What are you talking about? This thread is about the LSJ.

 

my bad

 

That's fine, I was just pointing it out.

 

the stock internals are good for way more than the m62 can pump. These guys with 2.5" pulleys are instantly losing 70hp in parasitic loss to the m62 when they are spinning it that high. With the thermal innefficiency at that level a turbo or twin screw could also be tuned far more aggressively because of much lower ACT's. Flowing the same CFM (don't use boost in psi to compare two different types of forced induction...just please don't, you should know why) a proper turbo setup is gonna be making well over 100hp more than the cars with 2.5"s and 2.6"s with relatively the same stress on the internals. So just to get an idea... I guaruntee 350whp being safe on the stock longblock with a turbo setup. watch the tranny at that point though. and axles are donezo.